Recently, surface crack nondamaging technology has been developed to render harmless surface cracks that can reduce the fatigue limit of metals by 20–60%. This is due to the effects of compressive residual stress induced by shot peening. To improve the reliability of high‐strength steel equipment designed against fatigue limit using surface crack nondamaging technology, the following characteristics were determined: (1) the effects of surface crack aspect ratio on maximum harmless crack depth (a_hlm) at high‐strength steel for three residual stress distributions; (2) the relationship between the maximum allowable crack depth (a_crN) and a_hlm assuming the value of safety factor; (3) the relationship between minimum detectable crack depth via nondestructive inspection (a_NDI) and a_hlm, assuming that nondestructive inspection could detect the crack with sufficient probability; and (4) the relationships between a_hlm, a_NDI, and a_crN.

中文翻译：

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使用喷丸强化技术，通过表面裂纹无损技术提高抗疲劳极限设计的高强度钢的可靠性

最近，已经开发出了表面裂纹无损技术，以使表面裂纹无害化，从而可以将金属的疲劳极限降低20-60％。这是由于喷丸引起的压缩残余应力的影响。为了提高高强度钢板的设备使用表面裂纹nondamaging技术对疲劳极限设计的可靠性，确定了以下特征：（1）的表面裂纹纵横比上最大无害裂纹深度（影响一个_HLM在高强度钢）对于三个残余应力分布；（2）允许的最大裂纹深度（之间的关系一个_CRN）和一个_HLM假设安全系数的值；（3）通过非破坏性的检查最小可检测裂纹深度之间的关系（一个_NDI）和一个_HLM，假设非破坏性的检查能够检测具有足够的概率裂纹; 和（4）之间的关系一个_HLM，一个_NDI，和一个_CRN。